Thursday, February 17, 2011

The essence of this process is very fundamental indeed. We may understand it best by comparing the work of a fifty-year-old carpenter with the work of a novice. The experienced carpenter keeps going. He doesn’t have to keep stopping, because every action he performs, is calculated in such a way that some later action can put it right to the extent that it is imperfect now. What is critical here, is the sequence of events. The carpenter never takes a step which he cannot correct later; so he can keep working, confidently, steadily.

The novice by comparison, spends a great deal of his time trying to figure out what to do. He does this essentially because he knows that an action he takes now may cause unretractable problems a little further down the line; and if he is not careful, he will find himself with a joint that requires the shortening of some crucial member – at a stage when it is too late to shorten that member. The fear of these kinds of mistakes forces him to spend hours trying to figure ahead: and it forces him to work as far as possible to exact drawings because they will guarantee that he avoids these kinds of mistakes.

The difference between the novice and the master is simply that the novice has not learnt, yet, how to do things in such a way that he can afford to make small mistakes. The master knows that the sequence of his actions will always allow him to cover his mistakes a little further down the line. It is this simple but essential knowledge which gives the work of a master carpenter its wonderful, smooth, relaxed, and almost unconcerned simplicity.

Wednesday, February 16, 2011

Just tried to buy an app via the Mac App Store and it was absolutely refusing to take my money. Various suggestions I've seen on the web such as clearing caches,resetting them via iTunes advanced preferences, rebooting, retrying, using slight variations of my account name all made no difference whatsoever.

The solution turned out to be manually signing in using the Store menu (manually sign out if you are already signed in). At that point I was allowed to update/verify my billing information and subsequent purchase attempts worked.

In previous attempts, I had not signed in manually, but rather had the App Store do the sign-in after I attempted to purchase.

One things that's been tripping me up a bit when writing code that's supposed to be portable between iOS and Cocoa is the removal of NSPoint, NSSize, NSRect and their associated functions from Foundation in iOS. This is a real shame, because otherwise the Foundations are highly compatible.

One way to rectify this situation would be to start using CG* structs and functions on the desktop as well. However, this introduces a dependency on CoreGraphics that shouldn't be there for Foundation-based code.

My alternative is to standardize on NSPoint and friends, and map those to their CG alternatives on iOS. That way, I have minimized my dependencies, with only a small header file to pay for it: PhoneGeomtry.h